Physics
Scientific paper
Dec 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsa51a1920l&link_type=abstract
American Geophysical Union, Fall Meeting 2011, abstract #SA51A-1920
Physics
[2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2487] Ionosphere / Wave Propagation, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2790] Magnetospheric Physics / Substorms
Scientific paper
Recent studies have shown that Pi1B pulsations, observed on the ground at substorm onset, are not a result of small-scale ionospheric currents but have their origins within the magnetosphere. In addition, various case studies have shown that corresponding Pi1B signatures in space are, in fact, Doppler shifted observations of the magnetic signature of fast flows. In order to explore the relationship between ground- and space-based observations further, we have carried out a statistical study of 300 Pi1B events observed by the Cluster spacecraft during 2001-2004, when the spacecraft were well situated to acquire detailed observations in the plasma sheet. These data are compared to ground-based observations of Pi1B signatures in order to characterize differences in onset times and to determine the extent to which these observations are correlated.
Engebretson Mark J.
Lessard Marc
Mouikis Christopher
Weaver Ch.
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